Balanced hollow blast stoker grate



" Jan. 16, 1923;

P. KINANDER. BALANCED HOLLOW BLAST STOKER GRATE- Fl LED Dec. 16, 1921 2 SHEETSSHEET I LV/H/H/ IV/H A1 L:

. r I v INVENTOR A TTOR/Vi) patented alam. 155, 1923.

1 STATE BALANCED HOLLOW BLAST STOKER G-RATE.

Application filed December 16, 1921.

T all w hom it may concern:

Be it known that I, PETER KINANDER, a citizen of the United States, residing in the city of Jackson and State of Mississippi, have invented new and useful Improvements in Balanced Hollow Blast Stoker Grates, of which the following is a specification, reference being had to the accompanying drawings.

This invention is a balanced hollow blast stoker grate for use in furnaces of various kinds, and the objects of the invention are first, to provide a stoker grate and accessories, the several parts whereof are interchangeable and hollow and interiorly con nected so that a current or blast of air may be forced through the apparatus and into the fuel on the grate, both for the purpose of more complete consumption of the fuel and also to prevent or retard the burning out of the grate by air cooling the same; second, to provide means forblowing out and cleaning the several hollow elements of the grate of any accumulated ashes or the like; and third, to provide a balanced apparatus of the kind described which will require small power to operate.

In the drawings:

Figure 1 is a side elevation of this improved stoker grate, sections being broken out to show the hollow structure of the several elements and other details of construction.

Figure 2 is a vertical, transverse section through the hollow stringers, the superi1nposed, sectional, hollow tuyere side plates, and one of the hollow stoker bars.

I igure 3 is a cross sectional view of one of the stoker bars dismounted, showing the cleanout door and operating rod.

Figure i is a detail of one of the clean out doors provided for the hollow stringers.

In carrying out this improvement hollow stringers 1 are provided and mounted between the dead plates 2 of the front wall 3 and rear wall 4, in usual manner and at the usual incline from front to rear. These stringers have tuyere holes 5 in their upper faces, and equi-spaced trunnion holes 6 along their inner sides. Sectional and hollow, or U-shaped side plates 7, having tuyere holes 8 along their inner sides, are mounted along upon the stringers 1 from. front to rear, and for this purpose tongues 9 may be formed along the upper edges'of the stringers to engage complementary grooves 10 along the under edges of the side plates.

Serial No. 522,745.

To facilitate replacement, the side plates 7 may be made in sections as shown in Figure 1. Hollow stoker bars 11, having hollow trunnions 12, are mounted along between the hollow stringers 1, by projecting the hollow trunnions 12 into the trunnion hol *s (5, These stoker bars are made open at their top sides and these sides are then closed by re movable tuyere plates 13 having the air or tuyere holes or apertures 14, through which the air currents may pass.

In cross section the stoker bars correspond to the ordinary bars in common use, but being hollow it results that a considerable weight is removed from the eccentric side of each bar, thus rendering the grate as a whole more easily operable. Also, while in the drawings and this specification the tuyere apertures in the stringers, side plates and stoker bar plates are represented as circular in form, they may of course be made in any other shape desired, as for instance in the form of slots.

The plates 13 carry lugs 37 which fit in- ,side against the hollow bars 11, thus holding the plates in place. The bars 11 are also provided with elongated openings 15 through their under sides, and have also the usual depending end lugs 16. Pivot holes 17 are formed in these end lugs and afford bearings for the pivots or journals 18 of the clean out doors 19 which are thus mounted across said openings 15. Integral operating arms 20 depend from one end of each of the doors, and to the lower ends of these arms are pivotally attached by means of pins 21 the usual opera-ting rod 22. A stoker rod 23 is pivoted at 24 to the operating rod, and thence extends out through the front of the furnace to the hand of the operator, or it may be controlled by an automatic machine, as desired. Stop lugs 25 and 26 are mounted on the inner faces of the lugs 16, one at each side of the doors 19, and are so positioned that when the doors are closed they will rest against the pins 25, and when they are opened they will strike the pins 26 and thereafter will rotate the stoker bars 11 as a whole. By this arrangement, as the stoker lever 23 is pulled outwardly, the corresponding, initial movement of the operating rod 22 results in opening the doors 19 of the stoker bars 11 against the pins 26, and allowing any accumulated ashes to be dis charged through the openings 15, after which the continued movement of the rod llO .22, results in the stoker bars 11 themselves being turned and lifted, they turning on their trunnions 12 in usual form and with the usual result of imgpelling rearwardly the fuel on the bars forming the grate. Clean out doors 2? are pivoted at in the inner ends of the hollow stringers 1, and have arms 29 pivoted at 30 to the rod 22, whereby as the rod 22 moves outwardly, these cleanout door," 27 are also opened to emit ashes from said hollow stringers. The usual dumping plate 31 is pivoted at 32 at the inner, lower end of the grate, and is operated by a dumping rod 3?; extended through the front of the furnace in usual form. r-lir ducts 3a connect with the outer ends of the hollow stringers l, and air is forced through these ducts into the stringers and thence through. the stoker bars and plates, by any conventional means. The currents of air will take the course indicated by the arrows.

While I have herein described a certain specific method of construction and assembling the elements of my invention, it is understood that same may be varied in minor details, not departing from the spirit of my invention as defined in the appended claims.

I claim:

1. A hollow blast stoker grate for furnaces, comprising hollow stringers positioned in the furnace, said stringers having tuyere openings along their upper faces and spaced trunnion holes along their inner sides; sectional, U-shaped side plates in inverted position mounted along upon the stringers, said plates having tuyere openings along their inner sides; hollow Stoker bars mounted between the hollow stringers, said bars being open at their upper and lower sides, and having hollow end trunnions projecting into the trunnion holes of the stringers at each side, the upper sides of the bars being closed by removable tuyere plates, and the lower sides by pivoted doors having limited movement; identical means for opening said doors and for turning said stoker bars; and means for forcing air through the stringers and bars.

bars; pivoted doors for closing the bottom sides of the Stoker bars; stop lugs on the stoker bars for limiting the opening and closing movement of the said doors; operatinn; arms depending from the doors; an

operating rod pivotally connected with the said operating arms of the doors; a stoker rod pivotally connected with the operating rod and extended through the front of the furnace; and means for forcing air through the apparatus.

3. A hollow blast StOlZGI QIQtQ for furnaces, embodying hollow stringers spaced apart, and having tuyere apertures through their upper faces and trunnion holes along their inner vertical sides; U=shaped,' side plates inverted on the stringers, having tuyere apertures through their inner vertical sides; hollow Stoker bars, having tuyere apertures through their upper sides, journaled between the stringers, the trunnions thereof being hollow for interior communi cation with the stringers; operating arms depending from the stoker bars; an operat- .ing rod pivotally connected with the operating arms; a stoker rod pivotally connected with the operating rod and extended through the front of the furnace; and means for forcing air through the apparatus.

4. A hollow blast stoker grate for furnaces, embodying a set of hollow stringers spaced apart and inclined from front to back, and having tuyere apertures through their upper faces, trunnion bearing holes through their inner vertical sides; and cleanout doors at their inner ends with means for operating the doors; hollow 's'toker bars open at top andbottom sides, journal'ed between the stringers, the trunnions thereof being hollow for interior communication with the stringers; removable tuyere plates for the upper sides of the stoker bars; clean out doors pivoted in the bottom sides of the stoker bars; stop lugs for limiting the opening and closing movement of the doors; operating arms depending from the doors; an operating rod pivotally connected with the operating arms of the 'doors; a stoker rod pivotally connected with the operating rod and extended through the front of the furnace; a dumping plate pivotally mounted at the inner end of the grate; a dumping rod pivoted to the dumping plate and extended through the front of the furnace;

and means for forcing air through the ap paratus.

5. In a stoker furnace, a hollow stolrer bar open at the bottom and having hollow trunnions and tuyere apertures through its upper side; a clean out door pivoted in the lower side and limited in its opening and closing movement; identical means for open ing and closing the door and for turning the stoker bar as a whole; and means for forcing air through the hollow trunnions into and through thebar.

6. In a stoker furnace embodying a set of hollow stringers and having trunnion holes along their inner vertical sides; hollow stoker bars journaled between the stringers,

7. In a Stoker furnace embodying a set of hollow stringers mounted in the furnace, said stringers having tuyere apertures through their upper faces; U-shaped side plates inverted 0n the stringers and having tuyere apertures through theirinner vertical sides adjacent the stoker bars; and means for forcing air through the structure.

PETER KINANDER.

WVitnesses:

J. W. BRoNNn, J. Ross SHARP. 

